yes unfortunatly I brought my uprights over a year ago from 3GE as per the book design - only just got round to getting the chassis on its wheels. Shame it doesn't mention in the book that it was designed for 15" wheels!
I'll see how I get on with the calipers, I've red that someone managed to get them on by swapping sides and putting them upside down... If I can't make it work then there may be a pair of (useless) uprights going up on eBay
